Remote positioning means



Oct. 13, 1942.

F. F. UEHLING 2,298,521 REMOTE POSITIONING MEANS Filed March 3, 1942 NVNTO I 25 t- 01;

Patented Oct. 13, 1942 h I r "2,298,521

umreo STATES PATENT orrica 7 REMOTE MEANS Fritz Frederick Uehling,Pascale, N. 1.

Application March 3, 1942, Serial No. 433,209 11 Claims. (Cl. 17229)This invention relates to improvements in rethe periphery oi a copperdisc i i and is electrimcte positioning means, one object of theinvencaliy connected therewith. The axis of the disc tion being toenergize a motor of any conven- II, the purpose 01' which will bepresently detional type to function in one direction or the scribed,coincides with that of the motor shaft other as required to change theposition of any 5 H, said disc being independently pivoted at I! ancewith changes in the position of another in either direction except aslimited by the fixed element at some local point. Another object 0!contact pieces 8 and I, Figure l. The circuit the motor at a velocityin' proportion to the dis- 10 said counter-clockwise direction starts atbattery move in order to assume a position corresponding 3 of the motorand wire ii to the fixedconing to that of the local element, thusreducing tact piece 9 which, when engaged by the contact the speed ofthe motor gradually while the remember HI, closes the circuit throughthe disc mote element is approaching said corresponding and a flexibleconnection I! back to the battery.

oi overstepping is eliminated thereby preventing to the fixed contactpiece! which,when engaged by driving torque regardless of the speed atwhich whichis carried by the disc II is midway between from the positionof the local element. and 22 both of which are in a fixed position andFigure 1 illustrates diagrammatically all of the when energized reactrespectively with armatures elements 01' the invention with theirelectrical and 24 The armatures 2i and 24 are fasdisc 111-8counter-clockwise direction, and when A reversible motor I, Figure 2,consisting of an the magnet 22 is energized its reaction with itsarmature 2 and two field windings 3 and 4, as armature 24 will tend tomove the disc in a illustrated diagrammatically in Figure 1, is inclockwise direction. "The magnets 21 and 22 are geared connection withthe brush 1 of a potenso designed that when the same amount ofourtiometer 5-4 as illustrated in Figure 2. The rent flows through eachor them, the resulting motor is electrically connected through fixedcontendencies to move the disc in opposite directions tact pieces 8 and0, and a movable contact memwill be equal thus causing the contactmember ber ll, Figure 1, so that, when contact is estab- II to. assumeits normal poation in which posilished' between the fixed contact pieceI and the 1 tionas previously stated said member is midway movablecontact member ill, it will be energized between the fixed contactmembers I and a and to rotate the motor shaft I I in acounter-clockmakeelectrical contact with neither of them.

wise direction and, through the gear-train A second potentiometerconsisting oi the brush 1 in a clockwise direction. Similarly,- whenconnected with the electrcmagnets 2i and 22 and tact is establishedbetween 0 and II, the motor wi h the potentiometer l-4 l through b g.will be energized to rotate said shalt in a-clockle 3' and wires 2!, 3|,1-! and 32, so that when wise direction and to simultaneously move thethe brushes 1 and II are in their midway posibrush I in 'acounter-clockwise direction The icna as-iliustrated, the amount ofcurrent flow flxed contact pieces 8 and 8 are electrically insuinghrough the magnet 2| will be the same as lated while the contactmemberll is i'astened to at fl ng h cugh the magnet 22 thus main 7function.

2 l V anteater 5 and 25'wiil equal the sum of the resistances 6 5 and21, thus equalizing the amount of current which flows through themagnets 2| and 22., Under this condition the reaction between theni'agnet 2| and its armature 23 tends to rotate the disc in acounter-clockwise direction with a 1 force equal to the reaction betweenthe magnet 22 and its armature 24 which tends to rotate the disc in aclockwise direction, thus causing V the contact member It to assume itsnormal position in which position of said member, neither of the motorcircuits previously traced will be closed and the motor will remainidle.

It follows from the above that a change in the position of the brush 25in a counter-clockwise direction to any new position such as 25a,

will increase the resistance 26 and decrease the resistance 21 thusincreasing the amount of current flowing through the magnet 2| anddecreasing the amount of current flowing through the magnet 22 therebyincreasing the force of 25 reaction between the magnet 2| anditsannature 23, anddecreasing the force of reaction between the magnet22 and its armature 24. The dominating force ofv the magnet 2| will thuscause the disc II to move in a counter-clockwise direction to engage thecontacts 9 and ill. The engagement of the contacts 9 and I0 closes thecircuit which energizes the motor to rotate the motor shaft M in aclockwise direction and simultaneously, through the gear 5 train33-34-3546, to move the brush 1m 8. counter-clockwise direction. Themotion of the brush 1 in this direction will obviously increase theresistance 6 and decrease the resistance 5 equals the sum of theresistances 5 and 26 at which time the amount of current flowing throughthe magnet 2| will again be the same as that flowing through the magnet22, the contact III will again have assumed its normal positlon asillustrated and the motor will cease to Similarly a change in theposition of position 2512 will increase the resistance 21 and decreasethe resistance 26 thus increasing the armature 24 and decreasing theforce of reaccause the disc H to move in a clockwise direction to engagethe contacts 8 and closing the circuit which energizes the motor torotate the motor shaft M in a counter-clockwise direction andsimultaneously to move the brush The motion of the brush 1 in thisdirection will increase the resistance 5 and decrease the resistance 8untiles tude under which condition the contact member It will againhaveassumed its normal position as illustrated and the motor will againcease to It follows from the above that when the brush 25 is moved toanynew position, the motor 75. her II to engage the con will beenergized to function'in the proper direction to move the brush 1 to acorresponding position in which position as previously described thecontact'member is will assume its normal position as illustrated todeenergize the motor. It is obvious however, from the foregoingdescription that so long as the magnets are unbalanced, so long willcontact be established between-contact member It and one or s the otherof the fixed contact pieces 8 and 9 thus causing the motor to functionat-full speed until the brush 1 has reached its balanced position inwhich "tion the current flowing through the two magnets 2| and 22 willbe thesame and the motor deenergized. The inertia of the motor willhowever cause the brush 1 to move beyond its balanced position thus, inthe manner previo ly described, causing the contact member I! to movebeyond its normal position to engage the other fixed contact piecethereby reversing the motor with a speed suflicient to create. aninertia that will move the brush 1 beyond its balanced positiondirection thus causing the contact member Hi to move in the oppositedirection sufliciently to again engage the fixed contact member 8. Theinertia of the motor will thus cause a hunting action which for anyfixed position of the brush 25 will cause the brush 1 to move back andforth through an angle depending upon the inertia involved. This actionis obviously very objection-- of the disc H by means of a hub 20. Thisma net, which is rotated by the motor' in one direction or the otherdepending upon which of the motor circuits is closed by thecontactmember it, in combination with said disc and the contacts 8 9 and I0provides, as will be seen, the means for eliminating the aforesaidhunting action and therefore constitutes a very important part of thisinvention.

It is obvious that when the magnet H is rotated by the motor in eitherdirection, eddy currents will be induced in the disc Ii which will reactwith the magnet to create a force or drag which tends to move the discin the same direc- 1 tion; furthermore this force is a function of thedecreases as the speed of the motor decreases until, when the magnet isat rest, said force will be zero. It follows therefore that when thebrushes 1 and 25 are in any balanced position. as for example the midwaypositions illustrated, the balanced forces of the electromagnets 2| and22 will maintain the contact member Ill-in its normal position asillustrated, the motor will be deene this condition is at rest will havenoinfluence whatsoever on the dis on the other hand if the brush 25 ismoved in a counter-clockwise direction to some new position 250, theforce of the reaction between the magnet 2i and the armature 23 will bedecreased while the force of reaction between the magnet 22 and thearmature 24 will be increased thus, in the manner previously described,causing the. contact mem- 1; piece .8, energizing 2i and 22 in theopposite rgized and the magnet is which under.

' net 22 with its armature magnets 2| and 22 If during the period oftime in vegch the magnet I9 has gained suflicient speed to breakelectrical contact between l and 8, the brush 1 has been movedsufficiently by the motor in a clockwise direction to balance theelectromagnets 2| and 22, then the contact member ID will remain in itstact has been broken between I and ID by the drag on the disc, the motorwill merely slow down until the drag on the disc in a counterclockwisedirection as magnet H has decreased to a point where the resultant forceof the two electromagnets 2| and 22 again dominates sufficiently in aclockwise direction to reestablish contact between 8 and ID. This actionwill obviously repeat itself until the reaction of the electromagnet 2|with its armature 23 balances the reaction of the electromag- 24 atwhich time the contact member ID will remain in its normal position asillustrated and the brush 1 will have assumed a new positioncorresponding to whatever new position'lnto which the brush 25 mighthave been moved. In this connection it should be pointed. out that forevery revolution of the magnet IS the brush 1 is moved a proportionateproper direction to balance the are balanced the resultant force of thetwo magnets 2| and 22 which establishes contact, not only becomessmaller and smaller but the required speed of the magnet oi suflicientmagnitude to becomes less and less so that as the brush 1 approaches anew position corresponding to any new position of the brush 2!, themotor will continue to slow down until the brush 1 has reached its finalposition in which the contact member to rotate the permanent magnet I!with respect to the disc II to electromagnets 2| and 22 are very muchout of retarding the speed 01' the brush as it approaches at the sametime.

Although the motor illustrated and described is a series wound motorwith I claim: 1. In a device of the class described, the combinationwith 3. In a device o1 the class described, the comreversible electricmotor, and for controlling its direction of balance and gradually tocontrol the and two fined contacts for alternative engagemerittherewith; of a copper disc rotatahle about c eeses a. In a device ofthe class described, the combination with a motor and a metallic elementrotatable thereby, of a circuit for energizing the motor to function inone direction, a second circuit for energizing the motor to function inthe opposite direction, a contact arm fastened to the rotatable metallicelement a fired contact piece in the path of the contact arm whichlimits the rotation of the element in one direction and which whenengaged by the contact arm closes the first circuit, a second fixedcontact piece in the path of the contact arm which limits the rctationof the element in'the opposite direction and which when engaged by t econtact arm closes the second circuit, a, movable magnet driven by themotor for creating a magnetic drag ontheelenient which when the motorfunctions in said one direction tends to move the contact arm away fromthe first contact piece and when the motor functions in the oppositedirection tends to move the contact arm away irons the second contactpiece, means for applying a force to "the element which tends toestablish contact between the contact arm and the first contactpiece,'means for applying a second force to the element which tends toestablish contact between the contact arm and the second piece, meansactuated by the motor for changing the ratio of the magnitude of saidforces, and means for changing said ratio independently oi said motoractuated ratio changing means.

5. In a device or the class described, the combination with a rotatabledisc, of a contact memher fastened to the periphery of the disc, atfixed contact piece in the path of the contact member for limiting itsmotion in clockwise direction and which when engaged by the contactmember establishes electric contact therewith, a second fixed contactpiece in the path or the contact member for limiting its motion in acounterclockwise direction and which when engaged by the contact memberestablishes electric contact therewith, a rotatable magnet located inproximity of the disc for creating an eddy current drag on the disc whenthe magnet is rotating, a motor,

for rotating the magnet, a circuit which is closed by contact betweenthe contact member and the first fixed contact piece for energizing themotor to rotate the magnet in the proper direction to create a drag onthe disc which tends to move the contact member contact piece, a secondcircuit which is closed by contact between-the contact member and thesecond fixed contact piece to rotate the magnet in the proper directionto create a drag on the disc which tends to move the contactmember awayfrom the second fixed contact piece, an armature fastened to the disc,an

the proper direction to establish contact between the contact member andthe second fixed contact electrical energy, a resistance, theelectromagnet and a second resistance, a second armature las tened tothe disc, a second electromagnet with which the second armature reactsin the proper direction to establish contact between the contact memberandthe first fixed contact, a fourth circuitwhich includes the source ofenergy, a third resistance, the second electromagnet and a fourthresistance, means actuated by the motor for changing the relativemagnitudes of the first and third resistances, and independent means forchanging the relative magnitudes of the second and fourth resistances.

6. In a deviw oi'the class described, the combination with a movablecontact member, of a fixed contact member capable of being engaged bythe movable contact member to close an electrio circuit, a second fixedcontact member capable of being engaged by the movable contact member toclose a second electric circuit, an electromagnt which when energizedtends to move the movable contact memberinto engagement with the firstcontact member, a second electromagnet which when energized tends tomove the movable contact member into engagement with the second fixedcontact membe means for energizing said electromagnets, a variableresistance for controlling the energy input to the first electromagnet,a second variable resistance for controlling the energy input to thesecond electromagnet, an electrical meansrin the first circuit forsimultaneously increasing the first resistance and decreasing the-secondresistance, a second electrical means in the second teneousiy decreasingthe first resistance and increasing the second resistance, meansactuated by the first electrical means for creating current drag whichtends to move an eddy the movable contact element away from the firstfixed contact element, means actuated by the second electrical means forcreating an eddy current drag which tends to move the'movable contactelement away from the second fined contact element, and independentmeans for changing the ratio of said variable resistances.

7. The combination with a motor, of a circuit 7 for energizing the motorto rotate in one direction, a second circuit for energizing the motor torotate in the opposite direction, a movable contact member, meansactuated by the motor for creating a drag which tends to movethe movablecontact member in thedirection of rotation. of the motor, a fixedcontact which said movable contact member, when moved in said onedirection, is capable of engaging to close the second circuit,electrical means for moving the movable away from the first fixed forenergizing the motor electromagnet with which the armature reacts incontact member into engagement with this fixed contact member inopposition to the drag in said opposite direction, a second fixedcontact which said movable contact member, when moved in said oppositedirection, is capable of engaging to close the first circuit," andelectrical means for moving the movable contact member into encasementwith the second fixed contact in opposition to the drag in said onedirection. a

8. The means set forth in claim 7, with additional means .forsimultaneously electrically energiaing both of said electrical means,independent means -for changing the ratio of the electrical input to oneof said electrical means with respect tothat of the other, and meansactuated by the motor for changing said ratio.

9. In a device of the hination with a reversible motor, of a circuit forenergizing the motor to rotate-in one direction,

circuit for simule class described, the commeans actuated by the motorfor a second circuit for energizing the motor to rotate in the oppositedirection, an electromagnet which when energized tends to close thefirst circuit and open the second circuit, a second electromagnet whichwhen energized opposes the first electromagnet and tends to close thesecond circuit and open the first circuit, means for energizing bothelectromagnets simultaneously, creating a drag in one direction or theother depending upon the direction of rotation of the motor, means forapplying the drag in said one direction to oppose the action of thefirst electromagnet and tending to open the first circuit, means forapplying the drag in said other direction to oppose the action of thesecond electromagnet and tending to open the second circuit, meansactuated by the motor for changing the ratio of energy input of thefirst electromagnet with respect to that of the second, and independentmeans for changing said ratio.

10. In a device of the class described, the combination with areversible motor, of a circuit for energizing the motor to rotate inone. direction,

a second circuit for energizing the motor to rotate in the oppositedirection, means actuated by the motor for creating an eddy current dragin the direction of its rotation, electrical means which tends to closethe first circuit, means actuated by the drag in said one directionwhich tends to open the first circuit, a second electrical means whichtends to close the second circuit, means actuated by the drag in saidopposite direction which tends to open the second circuit, a thirdcircuit which includes the first electrical means, a fourth circuitwhich includes the secergy in both of said third and fourth circuits, acircuit, a second 1 contact member.

variable resistance in the fourth circuit, means actuated by the motorfor simultaneously changing both of said resistances, and independentmeans for simultaneously changing said resistances.

- 11. In a device of bination with a movable contact member, of a fixedcontact member for limiting the motion of the movable contact member inone direction, a second fixed contact member for limiting the motion ofthe movable contact member in the opposite direction, means for applyinga force to the movable contact member in said one direction to cause itsengagement with the first fixed contact member, means for applying aforce to the movable contact member in said opposite direction to causeits engagement with the second fixed contact member, means for changingthe ratio of the magnitude of the first force with respect to that ofthe second force, means for creating a magnetic drag, means for applyingthe drag to the movable contact member, an electric circuit which isclosed by engagement of the movable contact member with the first fixedcontact member, electrical means in said circuit for actuating saidratio changing means in one direction and simultaneously actuating saiddrag creating means to move the movable contact member away from thefirst fixed contact member, a second electric circuit which is closed byengagement of the movable contact member with'the second fixed contactmember, and a second electrical means in the second circuit foractuating said ratio changing means in the opposite direction andsimultaneously actuating said drag creating means to move the movablecontact member away from the second fixed F. FREDERICK UEHLING- theclass described, the com-

